chalk formation
Cretacic Cre*tac"ic [Webster 1913 Suppl. +PJC]

{Cretaceous acid}, an old name for carbonic acid.

{Cretaceous formation} (Geol.), the series of strata of various kinds, including beds of chalk, green sand, etc., formed in the Cretaceous period; -- called also the {chalk formation}. See the Diagram under {Geology}.

{Cretaceous period} (Geol.), the time in the latter part of the Mesozoic age during which the Cretaceous formation was deposited, and at the end of which the dinosaurs died out. See {Cretaceous}. [1913 Webster +PJC]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Chalk formation — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

  • Chalk Formation — The Chalk Formations of Europe are thick deposits of chalk, a soft porous white limestone, deposited in a marine environment during the upper Cretaceous Period. They appear most prominently in England. The formations are divided into three parts …   Wikipedia

  • Mooreville Chalk Formation — Stratigraphic range: Upper Cretaceous Type Geological formation Unit of Selma Group Sub units Arcola Limestone Member Underlies Demopolis Chalk Formation …   Wikipedia

  • Demopolis Chalk Formation — Stratigraphic range: Upper Cretaceous Type Geological formation Unit of Selma Group Sub units Bluffport Marl Member Underlies Ripley Formation Ov …   Wikipedia

  • Southern England Chalk Formation — The Wealden Anticline …   Wikipedia

  • Chalk — (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common… …   The Collaborative International Dictionary of English

  • Chalk drawing — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

  • Chalk line — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

  • Chalk mixture — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

  • Chalk period — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

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